Re: [Discuss-gnuradio] Ettus E310 sample rate

[Laura Huddleston]

So just to clarify, I would need to program the FPGA explicitly if I want to achieve a sample rate of higher than 8MS/s?

 

~~~~~~~~~~~~~~~~~~~~~

Laura Huddleston

 

From: Derek Kozel <address@hidden>
Sent: Friday, May 11, 2018 1:53 PM
To: Laura Huddleston <address@hidden>
Cc: address@hidden
Subject: Re: [Discuss-gnuradio] Ettus E310 sample rate

 

Hello Laura,

The ADCs and DACs do support running at 61.44 MS/s. However the ARM processor is not able to handle data traffic at that rate so some of the processing must be done in the FPGA. Depending on the application about 10 MS/s is an achievable rate.

Both 12 MS/s and 8 MS/s are not integer divisors of 61.44 MHz so the ADC rate is being changed behind the scenes to support those rates, probably to 16 or 32 MHz. You can explicitly set that by adding an argument to the benchmark_rate or similar utility.

benchmark_rate --args master_clock_rate=36e6 --rx_rate 12e6 --tx_rate 12e6
http://files.ettus.com/manual/page_configuration.html

Regards,

Derek

 

 

On Fri, May 11, 2018 at 7:37 PM, Laura Huddleston <address@hidden> wrote:

Happy Friday,

 

What is the max sample rate for the Ettus e310?

 

When I ssh in and perform the benchmark_test, I get the following:

 

$/usr/lib/uhd/examples/benchmark_rate --rx_rate 12e6 --tx_rate 12e6

.

 . [other stuff here]

   .

UHD Warning:

    The hardware does not support the requested TX sample rate:

    Target sample rate: 12.000000 MSps

    Actual sample rate: 8.000000 MSps

Testing transmit rate 8.000000 Msps on 1 channels

 

When I set the target sample rate to 16MS/s, I get OOOOOOOOOO.

 

Does this mean that 8MS/s is the highest sample rate which the e310 will work?

 

The data sheet says the max ADC/DAC sample rate is 61.44MS/s, so shouldn’t I be able to stream data at a divisible of this?

 

~~~~~~~~~~~~~~~~~~~~~

Laura Huddleston

 

 

_______________________________________________
Discuss-gnuradio mailing list
address@hidden
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio